// license:BSD-3-Clause // copyright-holders:Ernesto Corvi, Mariusz Wojcieszek, Aaron Giles /*************************************************************************** Amiga AGA hardware Driver by: Ernesto Corvi, Mariusz Wojcieszek, Aaron Giles Done: - palette - bitplane data fetching - support for up to 8 standard bitplanes - HAM8 mode - preliminary sprites To do: - incorrect hstart/hstop values in CD32 logo, lsrquiz & lsrquiz2 - sprite collisions ***************************************************************************/ #include "emu.h" #include "includes/amiga.h" /************************************* * * Debugging * *************************************/ #define GUESS_COPPER_OFFSET 0 #define LOG_SPRITE_DMA 0 /************************************* * * Palette * *************************************/ void amiga_state::aga_palette_write(int color_reg, uint16_t data) { int r,g,b; int cr,cg,cb; int color; color = ((CUSTOM_REG(REG_BPLCON3) >> 13) & 0x07)*32 + color_reg; r = (data & 0xf00) >> 8; g = (data & 0x0f0) >> 4; b = (data & 0x00f) >> 0; cr = m_aga_palette[color].r(); cg = m_aga_palette[color].g(); cb = m_aga_palette[color].b(); if (BIT(CUSTOM_REG(REG_BPLCON3),9)) { // load low nibbles cr = (cr & 0xf0) | r; cg = (cg & 0xf0) | g; cb = (cb & 0xf0) | b; } else { cr = (r << 4) | r; cg = (g << 4) | g; cb = (b << 4) | b; } m_aga_palette[color] = rgb_t(cr,cg,cb); } /************************************* * * Video startup * *************************************/ VIDEO_START_MEMBER(amiga_state,amiga_aga) { VIDEO_START_CALL_MEMBER( amiga ); m_aga_diwhigh_written = 0; } /************************************* * * Per-scanline sprite fetcher * *************************************/ void amiga_state::aga_fetch_sprite_data(int scanline, int sprite) { switch((CUSTOM_REG(REG_FMODE) >> 2) & 0x03) { case 0: m_aga_sprdata[sprite][0] = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0); m_aga_sprdatb[sprite][0] = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2); CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4; m_aga_sprite_fetched_words = 1; if (LOG_SPRITE_DMA) logerror("%3d:sprite %d fetch: data=%04X-%04X\n", scanline, sprite, m_aga_sprdata[sprite][0], m_aga_sprdatb[sprite][0]); break; case 1: case 2: m_aga_sprdata[sprite][0] = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0); m_aga_sprdata[sprite][1] = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2); CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4; m_aga_sprdatb[sprite][0] = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0); m_aga_sprdatb[sprite][1] = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2); CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4; m_aga_sprite_fetched_words = 2; if (LOG_SPRITE_DMA) logerror("%3d:sprite %d fetch: data=%04X-%04X %04X-%04X\n", scanline, sprite, m_aga_sprdata[sprite][0], m_aga_sprdatb[sprite][0], m_aga_sprdata[sprite][1], m_aga_sprdatb[sprite][1] ); break; case 3: m_aga_sprdata[sprite][0] = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0); m_aga_sprdata[sprite][1] = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2); CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4; m_aga_sprdata[sprite][2] = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0); m_aga_sprdata[sprite][3] = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2); CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4; m_aga_sprdatb[sprite][0] = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0); m_aga_sprdatb[sprite][1] = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2); CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4; m_aga_sprdatb[sprite][2] = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0); m_aga_sprdatb[sprite][3] = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2); CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4; m_aga_sprite_fetched_words = 4; if (LOG_SPRITE_DMA) logerror("%3d:sprite %d fetch: data=%04X-%04X %04X-%04X %04X-%04X %04X-%04X\n", scanline, sprite, m_aga_sprdata[sprite][0], m_aga_sprdatb[sprite][0], m_aga_sprdata[sprite][1], m_aga_sprdatb[sprite][1], m_aga_sprdata[sprite][2], m_aga_sprdatb[sprite][2], m_aga_sprdata[sprite][3], m_aga_sprdatb[sprite][3]); break; } m_aga_sprite_dma_used_words[sprite] = 0; } void amiga_state::aga_update_sprite_dma(int scanline) { int dmaenable = (CUSTOM_REG(REG_DMACON) & (DMACON_SPREN | DMACON_DMAEN)) == (DMACON_SPREN | DMACON_DMAEN); int num, maxdma; /* channels are limited by DDFSTART */ maxdma = (CUSTOM_REG(REG_DDFSTRT) - 0x14) / 4; if (maxdma > 8) maxdma = 8; /* loop over sprite channels */ for (num = 0; num < maxdma; num++) { int bitmask = 1 << num; int vstart, vstop; /* if we are == VSTOP, fetch new control words */ if (dmaenable && (m_sprite_dma_live_mask & bitmask) && (m_sprite_dma_reload_mask & bitmask) && !(m_sprite_ctl_written & bitmask)) { /* disable the sprite */ m_sprite_comparitor_enable_mask &= ~bitmask; m_sprite_dma_reload_mask &= ~bitmask; /* fetch data into the control words */ CUSTOM_REG(REG_SPR0POS + 4 * num) = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) + 0); CUSTOM_REG(REG_SPR0CTL + 4 * num) = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) + 2); CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) += 4; /* fetch additional words */ switch((CUSTOM_REG(REG_FMODE) >> 2) & 0x03) { case 0: break; case 1: case 2: CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) += 4; break; case 3: CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) += 3*4; break; } if (LOG_SPRITE_DMA) logerror("%3d:sprite %d fetch: pos=%04X ctl=%04X\n", scanline, num, CUSTOM_REG(REG_SPR0POS + 4 * num), CUSTOM_REG(REG_SPR0CTL + 4 * num)); } /* compute vstart/vstop */ vstart = (CUSTOM_REG(REG_SPR0POS + 4 * num) >> 8) | ((CUSTOM_REG(REG_SPR0CTL + 4 * num) << 6) & 0x100); vstop = (CUSTOM_REG(REG_SPR0CTL + 4 * num) >> 8) | ((CUSTOM_REG(REG_SPR0CTL + 4 * num) << 7) & 0x100); /* if we hit vstart, enable the comparitor */ if (scanline == vstart) { m_sprite_comparitor_enable_mask |= 1 << num; if (LOG_SPRITE_DMA) logerror("%3d:sprite %d comparitor enable\n", scanline, num); } /* if we hit vstop, disable the comparitor and trigger a reload for the next scanline */ if (scanline == vstop) { m_sprite_ctl_written &= ~bitmask; m_sprite_comparitor_enable_mask &= ~bitmask; m_sprite_dma_reload_mask |= 1 << num; CUSTOM_REG(REG_SPR0DATA + 4 * num) = 0; /* just a guess */ CUSTOM_REG(REG_SPR0DATB + 4 * num) = 0; if (LOG_SPRITE_DMA) logerror("%3d:sprite %d comparitor disable, prepare for reload\n", scanline, num); } /* fetch data if this sprite is enabled */ if (dmaenable && (m_sprite_dma_live_mask & bitmask) && (m_sprite_comparitor_enable_mask & bitmask)) { aga_fetch_sprite_data(scanline, num); } } } /************************************* * * Per-pixel sprite computations * *************************************/ int amiga_state::aga_get_sprite_pixel(int x) { int pixels = 0; int num, pair; /* loop over sprite channels */ for (num = 0; num < 8; num++) if (m_sprite_comparitor_enable_mask & (1 << num)) { /* if we're not currently clocking, check against hstart */ if (m_sprite_remain[num] == 0) { int hstart = ((CUSTOM_REG(REG_SPR0POS + 4 * num) & 0xff) << 1) | (CUSTOM_REG(REG_SPR0CTL + 4 * num) & 1); if (hstart == x) { m_sprite_remain[num] = 16; m_sprite_shiftreg[num] = interleave_sprite_data(m_aga_sprdata[num][0], m_aga_sprdatb[num][0]); m_aga_sprite_dma_used_words[num] = 1; } } /* clock the next pixel if we're doing it */ if (m_sprite_remain[num] != 0) { m_sprite_remain[num]--; pixels |= (m_sprite_shiftreg[num] & 0xc0000000) >> (16 + 2 * (7 - num)); m_sprite_shiftreg[num] <<= 2; if (m_sprite_remain[num] == 0) { if (m_aga_sprite_dma_used_words[num] < m_aga_sprite_fetched_words) { int w = m_aga_sprite_dma_used_words[num]; m_sprite_remain[num] = 16; m_sprite_shiftreg[num] = interleave_sprite_data(m_aga_sprdata[num][w], m_aga_sprdatb[num][w]); m_aga_sprite_dma_used_words[num]++; } } } } /* if we have pixels, determine the actual color and get out */ if (pixels) { static const uint16_t ormask[16] = { 0x0000, 0x000c, 0x00c0, 0x00cc, 0x0c00, 0x0c0c, 0x0cc0, 0x0ccc, 0xc000, 0xc00c, 0xc0c0, 0xc0cc, 0xcc00, 0xcc0c, 0xccc0, 0xcccc }; static const uint16_t spritecollide[16] = { 0x0000, 0x0000, 0x0000, 0x0200, 0x0000, 0x0400, 0x1000, 0x1600, 0x0000, 0x0800, 0x2000, 0x2a00, 0x4000, 0x4c00, 0x7000, 0x7e00 }; int collide; int esprm, osprm; esprm = CUSTOM_REG(REG_BPLCON4) & 0x00f0; osprm = (CUSTOM_REG(REG_BPLCON4) & 0x000f) << 4; /* OR the two sprite bits together so we only have 1 bit per sprite */ collide = pixels | (pixels >> 1); /* based on the CLXCON, merge even/odd sprite results */ collide |= (collide & ormask[CUSTOM_REG(REG_CLXCON) >> 12]) >> 2; /* collapse down to a 4-bit final "sprite present" mask */ collide = (collide & 1) | ((collide >> 3) & 2) | ((collide >> 6) & 4) | ((collide >> 9) & 8); /* compute sprite-sprite collisions */ CUSTOM_REG(REG_CLXDAT) |= spritecollide[collide]; /* now determine the actual color */ for (pair = 0; pixels; pair++, pixels >>= 4) if (pixels & 0x0f) { /* final result is: topmost sprite color in bits 0-7 sprite present bitmask in bits 8-9 topmost sprite pair index in bits 12-13 */ uint32_t result = (collide << 8) | (pair << 12); /* attached case */ if (CUSTOM_REG(REG_SPR1CTL + 8 * pair) & 0x0080) return (pixels & 0xf) | osprm | result; /* lower-numbered sprite of pair */ else if (pixels & 3) return (pixels & 3) | esprm | (pair << 2) | result; /* higher-numbered sprite of pair */ else return ((pixels >> 2) & 3) | osprm | (pair << 2) | result; } } return 0; } /************************************* * * Bitplane assembly * *************************************/ uint8_t amiga_state::aga_assemble_odd_bitplanes(int planes, int obitoffs) { uint64_t *aga_bpldat = m_aga_bpldat; uint8_t pix = (aga_bpldat[0] >> obitoffs) & 1; if (planes >= 3) { pix |= ((aga_bpldat[2] >> obitoffs) & 1) << 2; if (planes >= 5) { pix |= ((aga_bpldat[4] >> obitoffs) & 1) << 4; if (planes >= 7) pix |= ((aga_bpldat[6] >> obitoffs) & 1) << 6; } } return pix; } uint8_t amiga_state::aga_assemble_even_bitplanes(int planes, int ebitoffs) { uint8_t pix = 0; if (planes >= 2) { uint64_t *aga_bpldat = m_aga_bpldat; pix |= ((aga_bpldat[1] >> ebitoffs) & 1) << 1; if (planes >= 4) { pix |= ((aga_bpldat[3] >> ebitoffs) & 1) << 3; if (planes >= 6) { pix |= ((aga_bpldat[5] >> ebitoffs) & 1) << 5; if (planes >= 8) pix |= ((aga_bpldat[7] >> ebitoffs) & 1) << 7; } } } return pix; } void amiga_state::aga_fetch_bitplane_data(int plane) { uint64_t *aga_bpldat = m_aga_bpldat; switch (CUSTOM_REG(REG_FMODE) & 0x03) { case 0: aga_bpldat[plane] = (uint64_t)read_chip_ram(CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2)); CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2; break; case 1: case 2: aga_bpldat[plane] = (uint64_t)read_chip_ram(CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2)) << 16; CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2; aga_bpldat[plane] |= ((uint64_t)read_chip_ram(CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2))); CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2; break; case 3: aga_bpldat[plane] = (uint64_t)read_chip_ram(CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2)) << 48; CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2; aga_bpldat[plane] |= ((uint64_t)read_chip_ram(CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2))) << 32; CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2; aga_bpldat[plane] |= ((uint64_t)read_chip_ram(CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2))) << 16; CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2; aga_bpldat[plane] |= (uint64_t)read_chip_ram(CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2)); CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2; break; } } /************************************* * * Hold and modify pixel computations * *************************************/ rgb_t amiga_state::aga_update_ham(int newpix) { switch (newpix & 0x03) { case 0: m_ham_color = m_aga_palette[(newpix >> 2) & 0x3f]; break; case 1: m_ham_color = rgb_t(m_ham_color.r(), m_ham_color.g(), (newpix & 0xfc) | (m_ham_color.b() & 0x03)); break; case 2: m_ham_color = rgb_t((newpix & 0xfc) | (m_ham_color.r() & 0x03), m_ham_color.g(), m_ham_color.b()); break; case 3: m_ham_color = rgb_t(m_ham_color.r(), (newpix & 0xfc) | (m_ham_color.g() & 0x03), m_ham_color.b()); break; } return m_ham_color; } /************************************* * * Single scanline rasterizer * *************************************/ void amiga_state::aga_render_scanline(bitmap_rgb32 &bitmap, int scanline) { uint16_t save_color0 = CUSTOM_REG(REG_COLOR00); int ddf_start_pixel = 0, ddf_stop_pixel = 0; int hires = 0, dualpf = 0, ham = 0; int pf1pri = 0, pf2pri = 0; int planes = 0; uint32_t *dst = nullptr; int ebitoffs = 0, obitoffs = 0; int ecolmask = 0, ocolmask = 0; int edelay = 0, odelay = 0; int next_copper_x; int pl; int defbitoffs = 0; rgb_t *aga_palette = m_aga_palette; int save_scanline = scanline; /* on the first scanline, reset the COPPER and HAM color */ if (scanline == 0) { m_previous_lof = CUSTOM_REG(REG_VPOSR) & VPOSR_LOF; // toggle lof if enabled if (CUSTOM_REG(REG_BPLCON0) & BPLCON0_LACE) CUSTOM_REG(REG_VPOSR) ^= VPOSR_LOF; copper_setpc(CUSTOM_REG_LONG(REG_COP1LCH)); m_ham_color = CUSTOM_REG(REG_COLOR00); } // in visible area? if (bitmap.valid()) { bool lof = CUSTOM_REG(REG_VPOSR) & VPOSR_LOF; if ((scanline & 1) ^ lof) { // lof matches? then render this scanline dst = &bitmap.pix32(scanline); } else { // lof doesn't match, we don't render this scanline // if we didn't switch lof we have a full non-interlace screen, // so we fill the black gaps with the contents of the previous scanline // otherwise just render the contents of the previous frame's scanline int shift = (m_previous_lof == lof) ? 1 : 0; std::copy_n(&m_flickerfixer.pix32(scanline - shift), amiga_state::SCREEN_WIDTH, &bitmap.pix32(scanline)); return; } } scanline /= 2; m_last_scanline = scanline; /* update sprite data fetching */ aga_update_sprite_dma(scanline); /* all sprites off at the start of the line */ memset(m_sprite_remain, 0, sizeof(m_sprite_remain)); /* temporary set color 0 to the genlock color */ if (m_genlock_color != 0xffff) CUSTOM_REG(REG_COLOR00) = m_genlock_color; /* loop over the line */ next_copper_x = 2; /* copper runs on odd timeslots */ for (int x = 0; x < amiga_state::SCREEN_WIDTH / 2; x++) { int sprpix; /* time to execute the copper? */ if (x == next_copper_x) { /* execute the next batch, restoring and re-saving color 0 around it */ CUSTOM_REG(REG_COLOR00) = save_color0; next_copper_x = copper_execute_next(x); save_color0 = CUSTOM_REG(REG_COLOR00); if (m_genlock_color != 0xffff) CUSTOM_REG(REG_COLOR00) = m_genlock_color; /* compute update-related register values */ planes = (CUSTOM_REG(REG_BPLCON0) & (BPLCON0_BPU0 | BPLCON0_BPU1 | BPLCON0_BPU2)) >> 12; if ( CUSTOM_REG(REG_BPLCON0) & BPLCON0_BPU3 ) planes |= 8; hires = CUSTOM_REG(REG_BPLCON0) & BPLCON0_HIRES; ham = CUSTOM_REG(REG_BPLCON0) & BPLCON0_HOMOD; dualpf = CUSTOM_REG(REG_BPLCON0) & BPLCON0_DBLPF; /* get default bitoffset */ switch(CUSTOM_REG(REG_FMODE) & 0x3) { case 0: defbitoffs = 15; break; case 1: case 2: defbitoffs = 31; break; case 3: defbitoffs = 63; break; } /* compute the pixel fetch parameters */ ddf_start_pixel = ( CUSTOM_REG(REG_DDFSTRT) & 0xfc ) * 2 + (hires ? 9 : 17); ddf_stop_pixel = ( CUSTOM_REG(REG_DDFSTOP) & 0xfc ) * 2 + (hires ? (9 + defbitoffs - ((defbitoffs >= 31) ? 16 : 0)) : (17 + defbitoffs)); if ( ( CUSTOM_REG(REG_DDFSTRT) ^ CUSTOM_REG(REG_DDFSTOP) ) & 0x04 ) ddf_stop_pixel += 8; // display window update_display_window(); /* extract playfield priorities */ pf1pri = CUSTOM_REG(REG_BPLCON2) & 7; pf2pri = (CUSTOM_REG(REG_BPLCON2) >> 3) & 7; /* extract collision masks */ ocolmask = (CUSTOM_REG(REG_CLXCON) >> 6) & 0x15; ecolmask = (CUSTOM_REG(REG_CLXCON) >> 6) & 0x2a; } /* clear the target pixels to the background color as a starting point */ if (dst != nullptr) dst[x*2+0] = dst[x*2+1] = aga_palette[0]; /* if we hit the first fetch pixel, reset the counters and latch the delays */ if (x == ddf_start_pixel) { odelay = CUSTOM_REG(REG_BPLCON1) & 0xf; edelay = ( CUSTOM_REG(REG_BPLCON1) >> 4 ) & 0x0f; if ( hires ) { obitoffs = defbitoffs + ( odelay << 1 ); ebitoffs = defbitoffs + ( edelay << 1 ); } else { if ( CUSTOM_REG(REG_DDFSTRT) & 0x04 ) { odelay = ( odelay + 8 ) & 0x0f; edelay = ( edelay + 8 ) & 0x0f; } obitoffs = defbitoffs + odelay; ebitoffs = defbitoffs + edelay; } for (pl = 0; pl < 8; pl++) m_aga_bpldat[pl] = 0; } /* need to run the sprite engine every pixel to ensure display */ sprpix = aga_get_sprite_pixel(x); /* to render, we must have bitplane DMA enabled, at least 1 plane, and be within the */ /* vertical display window */ if ((CUSTOM_REG(REG_DMACON) & (DMACON_BPLEN | DMACON_DMAEN)) == (DMACON_BPLEN | DMACON_DMAEN) && planes > 0 && scanline >= m_diw.top() && scanline < m_diw.bottom()) { int pfpix0 = 0, pfpix1 = 0, collide; /* fetch the odd bits if we are within the fetching region */ if (x >= ddf_start_pixel && x <= ddf_stop_pixel + odelay) { /* if we need to fetch more data, do it now */ if (obitoffs == defbitoffs) { for (pl = 0; pl < planes; pl += 2) { aga_fetch_bitplane_data(pl); } } /* now assemble the bits */ pfpix0 |= aga_assemble_odd_bitplanes(planes, obitoffs); obitoffs--; /* for high res, assemble a second set of bits */ if (hires) { /* reset bit offsets and fetch more data if needed */ if (obitoffs < 0) { obitoffs = defbitoffs; for (pl = 0; pl < planes; pl += 2) { aga_fetch_bitplane_data(pl); } } pfpix1 |= aga_assemble_odd_bitplanes(planes, obitoffs); obitoffs--; } else pfpix1 |= pfpix0 & 0x55; // 0x15 /* reset bit offsets if needed */ if (obitoffs < 0) obitoffs = defbitoffs; } /* fetch the even bits if we are within the fetching region */ if (x >= ddf_start_pixel && x <= ddf_stop_pixel + edelay) { /* if we need to fetch more data, do it now */ if (ebitoffs == defbitoffs) { for (pl = 1; pl < planes; pl += 2) { aga_fetch_bitplane_data(pl); } } /* now assemble the bits */ pfpix0 |= aga_assemble_even_bitplanes(planes, ebitoffs); ebitoffs--; /* for high res, assemble a second set of bits */ if (hires) { /* reset bit offsets and fetch more data if needed */ if (ebitoffs < 0) { ebitoffs = defbitoffs; for (pl = 1; pl < planes; pl += 2) { aga_fetch_bitplane_data(pl); } } pfpix1 |= aga_assemble_even_bitplanes(planes, ebitoffs); ebitoffs--; } else pfpix1 |= pfpix0 & 0xaa; /* reset bit offsets if needed */ if (ebitoffs < 0) ebitoffs = defbitoffs; } /* compute playfield/sprite collisions for first pixel */ collide = pfpix0 ^ CUSTOM_REG(REG_CLXCON); if ((collide & ocolmask) == 0) CUSTOM_REG(REG_CLXDAT) |= (sprpix >> 5) & 0x01e; if ((collide & ecolmask) == 0) CUSTOM_REG(REG_CLXDAT) |= (sprpix >> 1) & 0x1e0; if ((collide & (ecolmask | ocolmask)) == 0) CUSTOM_REG(REG_CLXDAT) |= 0x001; /* compute playfield/sprite collisions for second pixel */ collide = pfpix1 ^ CUSTOM_REG(REG_CLXCON); if ((collide & ocolmask) == 0) CUSTOM_REG(REG_CLXDAT) |= (sprpix >> 5) & 0x01e; if ((collide & ecolmask) == 0) CUSTOM_REG(REG_CLXDAT) |= (sprpix >> 1) & 0x1e0; if ((collide & (ecolmask | ocolmask)) == 0) CUSTOM_REG(REG_CLXDAT) |= 0x001; /* if we are within the display region, render */ if (dst != nullptr && x >= m_diw.left() && x < m_diw.right()) { int pix, pri; /* hold-and-modify mode -- assume low-res (hi-res not supported by the hardware) */ if (ham) { /* update the HAM color */ pfpix0 = aga_update_ham(pfpix0); pix = sprpix & 0xff; pri = (sprpix >> 10); /* sprite has priority */ if (sprpix && pf1pri > pri) { dst[x*2+0] = dst[x*2+1] = aga_palette[pix]; } /* playfield has priority */ else { dst[x*2+0] = dst[x*2+1] = pfpix0; } } /* dual playfield mode */ else if (dualpf) { /* mask out the sprite if it doesn't have priority */ pix = sprpix & 0x1f; pri = (sprpix >> 12); if (pix) { if ((pfpix0 & 0x15) && pf1pri <= pri) pix = 0; if ((pfpix0 & 0x2a) && pf2pri <= pri) pix = 0; } /* write out the left pixel */ if (pix) dst[x*2+0] = aga_palette[pix]; else dst[x*2+0] = aga_palette[m_separate_bitplanes[(CUSTOM_REG(REG_BPLCON2) >> 6) & 1][pfpix0]]; /* mask out the sprite if it doesn't have priority */ pix = sprpix & 0xff; if (pix) { if ((pfpix1 & 0x15) && pf1pri <= pri) pix = 0; if ((pfpix1 & 0x2a) && pf2pri <= pri) pix = 0; } /* write out the right pixel */ if (pix) dst[x*2+1] = aga_palette[pix]; else dst[x*2+1] = aga_palette[m_separate_bitplanes[(CUSTOM_REG(REG_BPLCON2) >> 6) & 1][pfpix1]]; } /* single playfield mode */ else { pix = sprpix & 0xff; pri = (sprpix >> 12); /* sprite has priority */ if (sprpix && pf1pri > pri) { dst[x*2+0] = dst[x*2+1] = aga_palette[pix]; } /* playfield has priority */ else { dst[x*2+0] = aga_palette[pfpix0]; dst[x*2+1] = aga_palette[pfpix1]; } } } } } #if 0 if ( m_screen->frame_number() % 16 == 0 && scanline == 250 ) { const char *m_lores = "LORES"; const char *m_hires = "HIRES"; const char *m_ham = "HAM"; const char *m_dualpf = "DUALPF"; const char *m_lace = "LACE"; const char *m_hilace = "HI-LACE"; const char *p = m_lores; if ( hires ) p = m_hires; if ( ham ) p = m_ham; if ( dualpf ) p = m_dualpf; if ( lace ) p = m_lace; if ( hires && lace ) p = m_hilace; popmessage("%s(%d pl od=%02x ed=%02x start=%d stop=%d hstart=%04x hstop=%04x diwhigh=%04x fetchbits=%d )", p, planes, odelay, edelay, ddf_start_pixel, ddf_stop_pixel, CUSTOM_REG(REG_DIWSTRT), CUSTOM_REG(REG_DIWSTOP), CUSTOM_REG(REG_DIWHIGH), defbitoffs ); //popmessage("%s(%d pl bplpt1=%06X, bpl1mod=%04x, offset=%x)", p, planes, CUSTOM_REG_LONG(REG_BPL1PTH), CUSTOM_REG(REG_BPL1MOD), hires_modulo_offset ); } #endif /* end of the line: time to add the modulos */ if (scanline >= m_diw.top() && scanline < m_diw.bottom()) { /* update odd planes */ for (pl = 0; pl < planes; pl += 2) CUSTOM_REG_LONG(REG_BPL1PTH + pl * 2) += CUSTOM_REG_SIGNED(REG_BPL1MOD); /* update even planes */ for (pl = 1; pl < planes; pl += 2) CUSTOM_REG_LONG(REG_BPL1PTH + pl * 2) += CUSTOM_REG_SIGNED(REG_BPL2MOD); } /* restore color00 */ CUSTOM_REG(REG_COLOR00) = save_color0; // save if (dst != nullptr) std::copy_n(dst, amiga_state::SCREEN_WIDTH, &m_flickerfixer.pix32(save_scanline)); #if GUESS_COPPER_OFFSET if (m_screen->frame_number() % 64 == 0 && scanline == 0) { if (machine.input().code_pressed(KEYCODE_Q)) popmessage("%d", wait_offset -= 1); if (machine.input().code_pressed(KEYCODE_W)) popmessage("%d", wait_offset += 1); } #endif } /************************************* * * Update * *************************************/ uint32_t amiga_state::screen_update_amiga_aga(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect) { if (cliprect.top() != cliprect.bottom()) return 0; // render each scanline in the visible region for (int y = cliprect.top(); y <= cliprect.bottom(); y++) aga_render_scanline(bitmap, y); return 0; }